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A high-isolation polarization-independent miniature free-space circulator

A free space, high isolation technology, applied in the field of optical communication, can solve unsatisfactory and difficult problems, and achieve the effect of low cost, high isolation, and small size

Active Publication Date: 2022-04-08
FUZHOU PHOTOP QPTICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The existing low-cost miniaturized free-space circulator technology is limited by the polarization splitting coating capability and the temperature characteristics of the Faraday rotator, such as figure 1 As shown in the schematic diagram, usually the isolation from port 2 (common end) to port 1 (transmitter) is within a certain wavelength range and temperature range. dB=-10*log(Po / Pi), Pi represents the incident optical power, Po represents the outgoing optical power)
If the temperature range is large, especially in the application scenario of 5G fronthaul, it is necessary to meet the temperature range of -40°C to 85°C. At this time, the isolation is only less than 20dB, which cannot meet the requirements of some single-channel rates of 25Gb / s. s and above optical modules require a circulator isolation greater than 30dB

Method used

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  • A high-isolation polarization-independent miniature free-space circulator
  • A high-isolation polarization-independent miniature free-space circulator
  • A high-isolation polarization-independent miniature free-space circulator

Examples

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Embodiment 1

[0045] Such as Figures 2 to 4 As shown in one of them, the present invention includes a first polarization beam splitter assembly 1, a first polarization rotation mechanism 2, a first polarization beam splitter 3, a 45-degree half-wave plate 4, a second polarization beam splitter 5, and a second polarization beam splitter arranged in sequence. The rotation mechanism 7 and the second polarization splitting assembly 8;

[0046] Wherein, the first polarization splitting assembly 1 includes a first 45-degree rhombic prism 11 and a first 45-degree right-angle prism 12, the lower end surface of the first 45-degree rhomboid prism 11 is connected to the first 45-degree right-angle prism 12 The oblique surfaces of the first 45-degree orthorhombic prism 11 and the first 45-degree right-angle prism 12 are bonded together and are coated with a first polarizing beam-splitting film 13. One of the first 45-degree right-angle prisms 12 The right-angled surface is opposite to the first polar...

Embodiment 2

[0077] Such as Figure 6 As shown, according to the inventive concept of Embodiment 1, the desired position of the common end can be achieved by changing the angle between the optical axis of the half-wave plate and the direction of polarization or by changing the bonding position of the second polarization splitting component, thereby enabling Many implementation structures have been derived.

[0078] The implementation structure of this embodiment is roughly the same as that of Embodiment 1, except that the second polarization rotation mechanism 7 includes a -22.5 degree half wave plate 71, a -67.5 degree half wave plate 72 and a second 45 degree Faraday Rotating plate 73, one end surface of the -67.5 degree half wave plate 72 is attached to the end surface of the second 45 degree rhombic prism 81 close to the second polarization rotation mechanism 7, and one end surface of the -22.5 degree half wave plate 71 The second 45-degree right-angle prism 83 is attached to the righ...

Embodiment 3

[0083] Such as Figure 7 As shown, the present embodiment is substantially the same as Embodiment 2, the difference being that one end surface of the -67.5 degree half-wave plate 72 and the second 45 degree right-angle prism 83 are close to the right-angle surface of the second polarization rotation mechanism 7. One end surface of the -22.5 degree half-wave plate 71 is attached to the end surface of the second 45 degree rhombic prism 81 opposite to the second polarization rotation mechanism 7. At this time, the upper surface of the second 45 degree rhombic prism 81 The end face is attached to the slope of the second 45-degree rectangular prism 83 .

[0084] The structure of this embodiment is a typical structure in which the transmitting end and the common end are coaxial, which can realize the coaxiality of the transmitting end and the common end. In this structure, due to the fact that the upper and lower optical paths from the transmitting end to the common end and the com...

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Abstract

The invention discloses a high-isolation polarization-independent miniature free-space circulator, which is characterized in that it includes a first polarization splitting component, a first polarization rotation mechanism, a first polarization splitter, and a 45-degree half-wave plate arranged in sequence , the second polarization beam splitter, the second polarization rotation mechanism and the second polarization beam splitting component; the optical components of the present invention can be integrated together by gluing or deepening optical glue or optical glue process, and have small volume, compact structure and integrated , low cost, easy processing and mass production, and high reliability; and the present invention has significant advantages such as high isolation, low insertion loss, and polarization-independent, and all performance indicators fully meet industry standards, especially high-speed optical signals ( ≥25Gps) transmission on the performance index requirements of optical circulators.

Description

technical field [0001] The invention relates to the field of optical communication, in particular to a polarization-independent miniature free-space circulator with high isolation. Background technique [0002] The optical circulator is a non-reciprocal optical passive device with multi-port input and output. Its function is to make the optical signal only be transmitted along the specified port sequence. When the transmission sequence of the optical signal is changed, its loss is very large. Signal isolation can thus be achieved. A typical structure has N (N greater than or equal to 3) ports, as shown in the attached manual figure 1 As shown, when light is input through port 1, light is output through port 2, when light is input through port 2, light is output through port 3, and so on. [0003] The non-reciprocal properties of optical circulators are realized by utilizing the Faraday effect of magneto-optical materials. The Faraday effect refers to the phenomenon that t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/27
CPCG02B6/2773G02B6/2746G02B6/2793
Inventor 贾旭于光龙郑熙任策
Owner FUZHOU PHOTOP QPTICS CO LTD
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